(100229) Jeanbailly Outer Main-belt Asteroid
Discovered on 10 August 1994 by E. W. Elst at La Silla.
Jean-Sylvain Bailly (1736–1793) was a French astronomer, mathematician and freemason. In 1759 he calculated an orbit for the next appearance of Halley's comet and in 1771 he published his essay Sur les inégalités de la lumière des satellites de Jupiter.Naming citation (WGSBN Bull. 5, #21, 6), IAU / Minor Planet Center, via NASA/JPL
Where Jeanbailly is today
Seen from above the solar system on 2026-10-14: Jeanbailly is 3.14 au from the Sun and 2.24 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 100229 |
| Provisional designation | 1994 PB18 |
| Orbit class | Outer Main-belt Asteroid |
| Diameter | 8.86 km (#5,857 largest of 17,440 named asteroids with a measured size) |
| Albedo | 0.0900 |
| Rotation period | 113 hours |
| Absolute magnitude (H) | 14.01 |
| Orbital period | 7.83 years |
| Semi-major axis | 3.94 au |
| Perihelion – aphelion | 3.00 – 4.88 au |
| Eccentricity | 0.239 |
| Inclination | 4.76° |
| Closest distance between its orbit and Earth's (MOID) | 2.00 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.
Also named after someone called Sylvain
All asteroids named after someone called Sylvain
Also discovered on 10 August 1994
- (6836) Paranal
- (7661) Reincken
- (7960) Condorcet
- (8205) Van Dijck
- (8890) Montaigne
- (9079) Gesner
- (9205) Eddywally
- (9392) Cavaillon
- (9393) Apta
- (9394) Manosque
- (9395) Saint Michel
- (9638) Fuchs